package com.example.a14874.listviewtraining;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class StuAdapter extends BaseAdapter
{
    private ArrayList<Student> studentArrayList;
    private Context context;

    public StuAdapter(Context context, ArrayList<Student> studentArrayList){
        this.context=context;
        this.studentArrayList = studentArrayList;
    }
    @Override
    public int getCount() {
        return studentArrayList.size();
    }

    @Override
    public Object getItem(int i) {
        return studentArrayList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }
    int count = 0;
    @Override
    public View getView(final int i, View view, ViewGroup viewGroup) {
        Log.e("StuAdapter", "getview " + i + " count = " + count);

        // 先判断view是不是空 非空可以复用 不需要重新构建 节省内存
        if(view == null) {
            count++;
            LayoutInflater layoutInflater = LayoutInflater.from(context);
            view = layoutInflater.inflate(R.layout.my_list_item_1,
                    viewGroup, false);

            // 使用Holder保存子组件 避免每次使用时重复find
            StuViewHolder holder = new StuViewHolder();
            holder.headImg = view.findViewById(R.id.headView);
            holder.nameView = view.findViewById(R.id.nameView);
            holder.ageView = view.findViewById(R.id.ageView);
            holder.ivDel = view.findViewById(R.id.iv_del);
            view.setTag(holder);
        }

        Student stu = studentArrayList.get(i);

        StuViewHolder holder = (StuViewHolder) view.getTag();

        holder.headImg.setImageResource(stu.getImgid());
        holder.ageView.setText(String.valueOf(stu.getAge()));
        holder.nameView.setText(stu.getName());
        holder.ivDel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                studentArrayList.remove(i);
                notifyDataSetChanged();
            }
        });
        return view;
    }
}
